Improvement in pump-valves



w. H. moms,,aec'a. CHARLOTTE THOMAS, Executrjx.

' PUMP-VALVE; $1 ,131,497,- rm imau 22, 1875;

Ei i 1 V WITNESSES:

v vATTORNEYS.

UNITED. STATES PATENT OFFICE.

CHARLOTTE THOMAS, OF SACRAMENTO, CALIFORNIA, EXECUTRIX OF WILLIAM H.THOMAS, DECEASED.

y IMPROVEMENT m PUMP-VALVES.

Specification forming part of Letters Patent No. 181,497, dated August22, 1876; application filed April 10, 1876.

To all whom it may concern Be it known that W. H. THOMAS, deceased, lateof the cityand county of Sacramento, State of- California, did invent acertain Improved Fump-Valve; and the following specification is a fulland exact description of the same, reference being, had to theaccompanying drawing, in which Figure 1 is a vertical section. Fig. 2 isa cross-section on line a: w of Fig. 1, and Fig. 3 a bottom-plan view ofthe valve and its case.

The object of the invention is to provide an improved substitute forpuppet-valves heretofore in use.

To this end the invention relates particularly to thevalve-seat,composed' of hard metal and having a beveled rim, the metalvalve having an annulus of soft metal secured in a suitable cavity, andthe vertical guides for causing the valve to seat itself accurately,these elements being conjoined under the particular arrangementhereinafter described.

Referring to the drawing, B is the cylindrical valve-case; A, the valve,provided with.

tailed in cross-section, so that the'metal cannot be removed ordisplaced by the jarring occasioned by the operation of the valve. Theraised valve-seat g is circular in form and beveled to a sharp edge, asshown, so that it will embed itself in the soft-metal annulus b. Thestem Hot the valve guides it with considerable accuracy; but to insure aperfectly watertight joint it is necessary to employ the guidebars 0, inorder to prevent the valve turning on its axis, and compel it to seatitself in such a manner that each part of the beveled rim will'alwaysstrike in the same part of the annulus. If the valve were allowed toturn on its axis a water-tight joint would be seldom formed, since thebeveled rim will usually wear unequally, and the soft-metal annulusisordinarily not perfectly homogeneous in quality.

A valve provided with a soft-metal rim is not claimed; but

I claim- The combination of theraised beveled rim or seat 9, the notchedvalve, provided with the soft-metal annulus b, secured in a dovetailcavity, the vertical parallel guide-bars o a, projectingfrom the headL,as shown and described, to operate as specified.

CHARLOTTE THOMAS, Ewecutriw.

